CVE-2026-93811Hinoki check available

Kernel memory leak via ksmbd ACL decoding

Published Sep 24, 2026 · Updated Sep 24, 2026

Memory leaks in Linux ksmbd 6.12.110 and earlier and 6.18.52 and earlier allow attackers to leak kernel memory via unspecified vectors. ksmbd_vfs_get_sd_xattr skips freeing acl.sd_buf when NT ACL decoding fails and returns success with a stale output pointer when the decoded descriptor is undersized. The path requires ksmbd to retrieve a stored NT ACL; published material does not establish attacker privileges or a resulting crash.

CVSS severityUnavailable
Unscored
EPSS probability0.17%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Memory leaks in Linux ksmbd 6.12.110 and earlier and 6.18.52 and earlier allow attackers to leak kernel memory via unspecified vectors. ksmbd_vfs_get_sd_xattr skips freeing acl.sd_buf when NT ACL decoding fails and returns success with a stale output pointer when the decoded descriptor is undersized. The path requires ksmbd to retrieve a stored NT ACL; published material does not establish attacker privileges or a resulting crash.

The record

CVE
CVE-2026-93811
Published
Sep 24, 2026
Updated
Sep 24, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
Unavailable
Privileges
Unavailable

Timeline

How it unfolded

  1. Sep 24, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 24, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <6.12.111
  2. Affected versionversion=0 <6.18.53
  3. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <6e6329322ad733c5b23555c609353841560b26bc
  4. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <c3836f55e0dab96314774215e12d87f63fa919f2
  5. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <d708a36634bb7b6f94d0e76d587d2ec50b2b93b5

What conditions does exploitation require?

Attack vectorUnavailable in this record.
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=0 <6.12.111; version=0 <6.18.53; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <6e6329322ad733c5b23555c609353841560b26bc; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <c3836f55e0dab96314774215e12d87f63fa919f2; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <d708a36634bb7b6f94d0e76d587d2ec50b2b93b5

Published CVSS scores

No CVSS assessment is available in this record.

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Activity data is delayed. The latest report is Sep 28, 2026.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
VectorUnavailable
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

No sourced classifications are available.

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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